Int J Med Inform - Detecting temporal expressions in medical narratives.

Tópicos

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Resumo

CKGROUND: Clinical practice and epidemiological information aggregation require knowing when, how long, and in what sequence medically relevant events occur. The Temporal Awareness and Reasoning Systems for Question Interpretation (TARSQI) Toolkit (TTK) is a complete, open source software package for the temporal ordering of events within narrative text documents. TTK was developed on newspaper articles. We extended TTK to support medical notes using veterans' affairs (VA) clinical notes and compared it to TTK.METHODS: We used a development set consisting of 200 VA clinical notes to modify and append rules to TTK's time tagger, creating Med-TTK. We then evaluated the performances of TTK and Med-TTK on an independent random selection of 100 clinical notes. Evaluation tasks were to identify and classify time-referring expressions as one of four temporal classes (DATE, TIME, DURATION, and SET). The reference standard for this test set was generated by dual human manual review with disagreements resolved by a third reviewer. Outcome measures included recall and precision for each class, and inter-rater agreement scores.RESULTS: There were 3146 temporal expressions in the reference standard. TTK identified 1595 temporal expressions. Recall was 0.15 (95% confidence interval [CI] 0.12-0.15) and precision was 0.27 (95% CI 0.25-0.29) for TTK. Med-TTK identified 3174 expressions. Recall was 0.86 (95% CI 0.84-0.87) and precision was 0.85 (95% CI 0.84-0.86) for Med-TTK.CONCLUSION: The algorithms for identifying and classifying temporal expressions in medical narratives developed within Med-TTK significantly improved performance compared to TTK. Natural language processing applications such as Med-TTK provide a foundation for meaningful longitudinal mapping of patient history events among electronic health records. The tool can be accessed at the following site: http://code.google.com/p/med-ttk/.

Resumo Limpo

ckground clinic practic epidemiolog inform aggreg requir know long sequenc medic relev event occur tempor awar reason system question interpret tarsqi toolkit ttk complet open sourc softwar packag tempor order event within narrat text document ttk develop newspap articl extend ttk support medic note use veteran affair va clinic note compar ttkmethod use develop set consist va clinic note modifi append rule ttks time tagger creat medttk evalu perform ttk medttk independ random select clinic note evalu task identifi classifi timeref express one four tempor class date time durat set refer standard test set generat dual human manual review disagr resolv third review outcom measur includ recal precis class interrat agreement scoresresult tempor express refer standard ttk identifi tempor express recal confid interv ci precis ci ttk medttk identifi express recal ci precis ci medttkconclus algorithm identifi classifi tempor express medic narrat develop within medttk signific improv perform compar ttk natur languag process applic medttk provid foundat meaning longitudin map patient histori event among electron health record tool can access follow site httpcodegooglecompmedttk

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